Apparatus for drawing hollow glass articles.



PATENTED MAY 5, 1908.

, LUBBERS.

APPARATUS FOR DRAWING HOLLOW GLASS ARTICLES.

APPLICATION FILED MAY 21, 1903. RENEWED APR. 25, 1906.

INVEHTOR IIIL..- 0 8 5 7 1 6 1 4 s 1 Y 1 u lllliillllIlll l i m H W n JL 1 W portions.

JOHN H. LUBBERS, QF ALLEGHENY, PENNSYLV FFICE;

ANIA, ASSIGNOR TO WINDOW GLASS MACHINE COMPANY, OF PITTSBURG,PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

APPARATUS FOR DRAWING HOLLOW GLASS ARTEECLES.

Specification of Letters Patent.

Patented May 5, 1908.

Application filed May 21, 1903, Serial No. 158,069. Renewed April 25,1906. Serial No. 313,681.

To all whom it may concern:

Be it known that 1, JOHN H. LUBBERS, a citizen of the United States,residing at Allegheny, Allegheny county, Pennsylvania, have inventedcertain new and useful Apparatus for Drawing Hollow Glass Articles, ofwhich the following is a full, clear, and exact description, referencebeing had to the ac companying drawings, forming part of thisspecification, in which Figure 1 is a vertical section showing thedrawing of a glass cylinder in accordance with myinvention Fig. 2 is anenlarged vertical section of the apparatus during the first portion ofthe drawing operation, and Fig. 3 is a view similar to Fig. 1, showingthe withdrawal of the air supply pipe after the cylinder has, been drawnto the desired length.

My invention relates to the drawing of hollow glass articles and isdesigned to provide for chilling the interior of the hollow article ator near the drawing point thereby enabling articles .of thicker glassto'b'e drawn than where outsidechilling is used, and also equalizing theheat of the molten bath of' glass which is more liable to chill in itsouter The inside chilling also enables the glass to be drawn at greaterspeedthan formerly, and is of especial advantage where heat is appliedto the bottom of the pot.

The invention'is designed to chill the glass by air or gaseous fluidwhich is introduced through the bait, the air being supplied at the samelevel, or substantially the same level with respect to that of the glassbath, throughout the drawing operations. By thus applying the air itseffect in chilling is substantially uniform throughout the drawing, andthe chilling efl'ect is much stronger than where the air is introducedthrough a central hole in the pot.

The invention is further designed to provide for withdrawing the hollowarticle andthe supply tube from each other after the drawing operationis completed, this being preferably accomplished by drawing the supplytube'upwardly out of the article after the drawing oi the glass articleis completed.

The invention also relates to the exhaust or relief of a small portionof the air supplied to the interior of the article during drawing,through a small hole which is opened by the [vent it from reaching theheads of the c The stationary air-supplypi'pe operator after the formingof the cap; so that a constant opening is provided through which theexcess air is'passed out as it becomes heated within the article. Thishas been found desirable, especially in connection with a graduatingvalve by which the sup 'ly of the air is controlled, since the small outet prevents the enlarging of the article '60 during drawing, which isotherwise liable to occur on accountof variations of pressure in thecylinder.

In the drawings, 2. re resents a double reversible pot into whic la'dledor otherwise supplied, this pot being supported upon trunnions 3, withinthe upper portion of a furnace 4, to which heat is supplied through aneye 5. The pot is arthe glass may be ranged to be'raised and loweredandto be turned over so that after the drawing opera tion'it maybereversed and the heat used to melt out the refuse glass. The pot may beeither of double form with holding cavities in This arrangement of potand furnace is not claimed by me it being the invention of LincolnThornburg. v

top and bottom, as shown, or of single form. I

4 I have shown the bait or drawing tool 6 v as consisting of axblowform, having a collar 7 W ich is hung 'on a hook 8 supported on thedrawing-frame 9. The drawing frame is guided between vertical supports10, 10, being lifted by a wirerope 11, or by other suitable'rnechanismf85 At an ntermediate {2 int of the blow pipe is provided apet coc 12 by which a small amount of the air may be allowed to pass outduring the drawing and after the cap is formed. This pet cock is turnedto open or partlyopen the hole, after the cap has been 7 ormed, 1tremaining open throughout the blowing operation. The low pipe isprovided with a stuffing box 13 in its top through which extends the 14,the lower end terminating near the level of the molten bath of glass inthe pot. The upper end of this suppl Y tube extends through and issecured to a piston 15 movipeof ordinary 80' air supply-pipe able withina long cylinder or tube 16', supported in any suitable way, thepistonhaving projections 17' on each facewh-ich ire-f y in- 1 der or tube.

17 enters through the top head of thecylinder 16, this tube beingprovided with the usual graduating valve 18 having a connection 19 bywhich it is slowly turned during the drawing operation, as described inmy previous patents, 702,013 and 7 02,014 granted on June 10th, 1902.Ahigh pressure air supply tube 20 enters the lower end of the cylinder16, this tube beingprovided with a suitable handcontrolled valve bywhich the operator may supply high pressure air to or exhaust it fromthe cylinder beneath the piston.

In carrying out the'drawing operation the. parts are in' the positionshown in Fig. 2, the operator supplying suflicient air. through a handvalve at the working pul it, and controlling the pipe 17 to form t eneckand then swell out the article to form the cap of the desired sizeof the cylinder or article to be drawn. The pet cock on the-blow, pipeis then opened, and the drawing of the article begins; and as,thearticle is drawn up- .wardly, air flows down through the upper cylinderand the supply pipe and emerges near the level of the molten glass andat the same level throughout the drawing opera tion. The supply ofairduring the" drawing re ula-ting device.

is regulated by the graduating valve to hold the articleat the samesize" as it is being drawn, the regulation being assisted by allowinganyexcessair, which is ex anded by 'the heat of the glass, to pass out trough the small pet cock, thus preventing an enlarging of thecylinder.The small air outlet acts in the manner of an automatic regulator toequalize the pressure in the artlcle' being drawn and keep-itsubstantially uniform. Expansion and contraction of the air is liable totake place during the drawing 0 eration and the outflow of air throughthis fiole will vary according to the varying conditions, in such a wayas to maintain .a'substantially constant pr ssure in the cylinder. Thispressure is preferably very small; and owing to, changes in thetemperature and humidity of the air it is found necessary to use someOtherwise, the'cylinder wil be enlargedand contracted and will bedifficult to flatten into commercial I glass. After sthe article isdrawn tothe desired length, high pressure air is admitted under thepiston, and the supply-tube is thereby forced up and withdrawn from thearticle and the blow-pipe, the parts taking the position shown in Fig.3. The blow-pipe is then lifted oii the frame and lowered with the ingtool, and at substantially thesame level throughout the drawingoperation. This tends to cool the central part of the molten bath, andrenders the glass of more uniform consistency throughout the bath. Italso produces a stronger chilling eiiect at or near the drawing point,enabling the drawing to r be carried out more rapidly, ,or enabling athicker article to be drawn if desired. Another advantage of this methodof supplying the air is-that the coldair supplied near the level of thebath tends to force the heated air inside the article toward its upperportions, thus tending to anneal them and revent rapid .cooling of theupper parts whic would give hard glass. This" is of special advantage indrawing longcylinders, where the upper parts of the cylinder areliftedto a level far above the bath. The use of the cylinder and pistonenables the supply tube to be quickly and easily-withdrawn from the tooland the article, while the apparatus is simple and not expensive. Theuse of the hand-controlled outlet between the gradu ating valve and thearticle'is of advantage, as

it provides a constant small outlet which is under the control of theoperator, who can judge as to the roper area of outlet to give thedesired resu t. After he has turned this outlet valve to open it to thedesired extent,

the air is then under the control of the graduating valve, whichautomatically varies the air supply as the drawing proceeds. v

Many changes maybe made in the form and arrangement of the drawingapparatus, the depending sup 1y tube, the means for withdrawing the tu eand article from each other, the hand controlled outlet, etc., withoutdeparting from my invention.

I laim:-

1. Apparatus for drawing hollow glass articles, comprising a hollowdrawing tool agranged to draw the glass upwardlygfrom a bath,connections arranged to'supply air to the interior of the article duringdrawing,

and a normally freely 0 en hand controlled air outlet arranged to. a owa small amount of air to pass out during the drawing of the article;substantially as described. 2. In a glass drawing apparatus, a hollowdrawing tool, and a depending air supply pipe over which the tool isdrawn during the drawing operationi substantially as de scribed.

3,. In a drawing apparatus for glass, a hollow drawing tool, an. airsupply tube over which the tool is drawn, and means for wlthdrawing thesupply tube from the hollow article after the drawing operation iscompleted; substantially asud escribed.

. 4. In glass drawing a paratus, a hollow drawing tool, an air supp yconnectlon leading thereto. and provide with an automat c graduatingvalve, and a hand controlled outlet between the graduating valve and thear- 5. In glass drawing a paratus, a drawing drawing tool, a supply tubeover which it within which the sup moves, and. an a1rsupply cylinder ortube y tube is arranged to telescope; substantia ly as described.

7. In the art of manufacturing g'lass,'a

- gatherer ada ted to draw glass in cylindrical or other inc osed form,an opemng therein and means for discharging a cooling fluid, through.said opening and at substantially the lower exposed portion of said drawduring the entire operation of drawing the glass substantially asdescribed. i

8. .In glass drawing apparatus a receptacle for molten glass, a drawingtool arranged to draw a hollow article upwardly therefrom and adepending air supply pipe around which the article is drawn upwardly;substantially as described.

9. In the art of manufacturing glass, a gatherer "dapted to draw glassin a cylindrical or other inclosed formhaving an outlet and an inlettube extendin through said gatherer and movable longitu inallyfrelativethereto; substantially as described.

10. In the art of manufacturing glass, a\ gatherer adapted to draw glassin cylindrical or other inclosed form, an opening therein and'means fordischargi'n' a cooling fluid through said opening at' su stantially thelower exposed portion of said draw during substantially the entireoperation of drawing the glass andsecondary means for withdrawing' saidfirst means from the gatherer; substantially as described.

11. In the art of manufacturing glass, a gatherer adapted to draw glassin cylindrical or other inclosed form, an opening therein, means fordischarging a cooling fluid through said opening at substantiallythe-lower exposed portion of said draw during'su'bs'tantially the entireoperation of drawing the glass and secondary means for.

(ill

' substantially as'described.

described.

lowerin the lower extremity 'of said first gatherer; substantially as I12. In the art' of manufacturing glass, a

' gatherer adapted to draw glass in cylindricalor other inclosed form,an opening therein, means for discharging a cooling fluid through saidopening at substantially thelower ex- .posedportion of saidglraw duringsubstantially the entire operation of drawing the glass and secondarymeans for lowering and withdrawing the ower extremity of said:

first means into a d from j said; gatherer;

' movement of sai 13. In the art of manufacturing glass, a

lng therein, a tube extensiblethr'ough said rical or other inclosedform'having an open-' o ening and means for reciprocating a por- 1 tionof said tube in said tially as describe 15. In the art o gatherersubstanf manufacturing glass, s

gatherer adapted to draw glass'in -cy lin rical orother inclosed formhaving an opening therein, a'tube supported from Wit out said gathererand extending thereinto said gatherer being arranged to travel upwardlywhile said tube remains stationary whereby a flow of fluid is dischargedin the body of" said draw below the bottom of said gatherer during theoperation of drawing glass; sub-. stantiallyas described. v

416. In the art of manufacturing glass, a gatherer, a downwardlyextensible tube in said gatherer and means for withdrawing said' tubetherefrom; substantially as describedl I I 17. In the artofmanufacturing glass, a gatherer and an inlet tube extending through saidgatherer and movable longitudin'allyv relative thereto; substantially asdescribed.

18 .-In the art'of manufacturing glass, a- I gath rer', an inlet tubearranged to extend into said gatherer and a piston adapted to move .saidinlet tube longitudinally relative;

said inlet tube-longitudinally re ative to said gatherer, and sto sarranged fto limit' the piston; substantially as, described. 1

20. In glass drawing apparatus, an' air supply pipehaving an open outletforair arrangek being drawn, substantially as described.

21 A tool for drawing hollow glass articles comprising a pipe andconnected bait, having anair inlet, and ro-vided with a separate openescape vent or variations or-excess pressure in the article and tiallyas described. Q

22. A tool for drawinghqllow glass articles havin an air inlet openingto the article, and a' free y open outlet to allow escape of excess airand equalize variations of ressure inthe article, substantially asdescri ed,

23. A paratus for drawing hollow glass articles raving an air inlet and"a constantly to equalize pressure in. thearticle pipe, substanvarticles, aconnectio'n supplying fluid under l my hand.

i regulating veil-t, both in communication with having a constantly openoutlet to the atmos phere between the fluid supply and the arti-'scribed.

24. In apparatus for drawing hollowglass the article being drawn,substantially as de ole, substantially as descri have hereunto set Intestimony whereof, I

pressure to the article, having a regulating vent automaticallyequalizing variations of JOHN H. LUBBERS.

pressure Within the article, substantially as Witnesses: describ e l.- vv GEO. B, BLEMING 25. A blow pipe for drawing glass articles I JoIrNMILLER. I

